| 1 | // RUN: %clang_cc1 -Wall -Wshift-sign-overflow -ffreestanding -fsyntax-only -verify %s |
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| 2 | |
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| 3 | #include <limits.h> |
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| 4 | |
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| 5 | #define WORD_BIT (sizeof(int) * CHAR_BIT) |
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| 6 | |
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| 7 | enum { |
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| 8 | X = 1 << 0, |
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| 9 | Y = 1 << 1, |
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| 10 | Z = 1 << 2 |
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| 11 | }; |
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| 12 | |
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| 13 | void test() { |
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| 14 | char c; |
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| 15 | |
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| 16 | c = 0 << 0; |
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| 17 | c = 0 << 1; |
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| 18 | c = 1 << 0; |
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| 19 | c = 1 << -0; |
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| 20 | c = 1 >> -0; |
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| 21 | c = 1 << -1; // expected-warning {{shift count is negative}} |
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| 22 | c = 1 >> -1; // expected-warning {{shift count is negative}} |
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| 23 | c = 1 << c; |
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| 24 | c <<= 0; |
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| 25 | c >>= 0; |
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| 26 | c <<= 1; |
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| 27 | c >>= 1; |
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| 28 | c <<= -1; // expected-warning {{shift count is negative}} |
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| 29 | c >>= -1; // expected-warning {{shift count is negative}} |
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| 30 | c <<= 999999; // expected-warning {{shift count >= width of type}} |
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| 31 | c >>= 999999; // expected-warning {{shift count >= width of type}} |
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| 32 | c <<= CHAR_BIT; // expected-warning {{shift count >= width of type}} |
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| 33 | c >>= CHAR_BIT; // expected-warning {{shift count >= width of type}} |
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| 34 | c <<= CHAR_BIT+1; // expected-warning {{shift count >= width of type}} |
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| 35 | c >>= CHAR_BIT+1; // expected-warning {{shift count >= width of type}} |
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| 36 | (void)((long)c << CHAR_BIT); |
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| 37 | |
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| 38 | int i; |
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| 39 | i = 1 << (WORD_BIT - 2); |
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| 40 | i = 2 << (WORD_BIT - 1); // expected-warning {{bits to represent, but 'int' only has}} |
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| 41 | i = 1 << (WORD_BIT - 1); // expected-warning {{sets the sign bit of the shift expression}} |
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| 42 | i = -1 << (WORD_BIT - 1); // expected-warning {{shifting a negative signed value is undefined}} |
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| 43 | i = -1 << 0; // expected-warning {{shifting a negative signed value is undefined}} |
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| 44 | i = 0 << (WORD_BIT - 1); |
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| 45 | i = (char)1 << (WORD_BIT - 2); |
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| 46 | |
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| 47 | unsigned u; |
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| 48 | u = 1U << (WORD_BIT - 1); |
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| 49 | u = 5U << (WORD_BIT - 1); |
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| 50 | |
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| 51 | long long int lli; |
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| 52 | lli = INT_MIN << 2; // expected-warning {{shifting a negative signed value is undefined}} |
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| 53 | lli = 1LL << (sizeof(long long) * CHAR_BIT - 2); |
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| 54 | } |
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| 55 | |
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| 56 | #define a 0 |
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| 57 | #define ashift 8 |
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| 58 | enum { b = (a << ashift) }; |
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| 59 | |
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| 60 | // Don't warn for negative shifts in code that is unreachable. |
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| 61 | void test_pr5544() { |
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| 62 | (void) (((1) > 63 && (1) < 128 ? (((unsigned long long) 1)<<((1)-64)) : (unsigned long long) 0)); // no-warning |
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| 63 | } |
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| 64 | |
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| 65 | void test_shift_too_much(char x) { |
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| 66 | if (0) |
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| 67 | (void) (x >> 80); // no-warning |
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| 68 | (void) (x >> 80); // expected-warning {{shift count >= width of type}} |
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| 69 | } |
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| 70 | |
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| 71 | typedef unsigned vec16 __attribute__((vector_size(16))); |
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| 72 | typedef unsigned vec8 __attribute__((vector_size(8))); |
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| 73 | |
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| 74 | void vect_shift_1(vec16 *x) { *x = *x << 4; } |
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| 75 | |
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| 76 | void vect_shift_2(vec16 *x, vec16 y) { *x = *x << y; } |
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| 77 | |
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| 78 | void vect_shift_3(vec16 *x, vec8 y) { |
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| 79 | *x = *x << y; // expected-error {{vector operands do not have the same number of elements}} |
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| 80 | } |
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| 81 | |
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